CN103018633A - Distribution grid (DG) contained fault interval judgment method based on impedance model short circuit fault characteristics - Google Patents

Distribution grid (DG) contained fault interval judgment method based on impedance model short circuit fault characteristics Download PDF

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Publication number
CN103018633A
CN103018633A CN2012105321033A CN201210532103A CN103018633A CN 103018633 A CN103018633 A CN 103018633A CN 2012105321033 A CN2012105321033 A CN 2012105321033A CN 201210532103 A CN201210532103 A CN 201210532103A CN 103018633 A CN103018633 A CN 103018633A
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fault
impedance
distribution network
dissymmetrical
node
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CN103018633B (en
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康忠健
田爱娜
冯艳艳
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China University of Petroleum Beijing CUPB
China University of Petroleum UPC East China
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China University of Petroleum UPC East China
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Abstract

The invention discloses a novel distribution grid (DG) contained fault interval judgment method. According to the DG contained fault interval judgment method, asymmetry of a power distribution system is considered, a DG contained three phase dissymmetrical impedance model is established, and short-circuit current fault characteristics in the DG contained impedance model are analyzed and extracted. According to the DG contained fault interval judgment method, system fault characteristic values in different simulation faults and actual faults are used as indexes for determining a fault interval.

Description

The DG distribution network failure interval that contains based on impedance model short trouble feature is judged
Technical field
The present invention relates to the interval localization method of a kind of distribution network failure, particularly consider the asymmetry of distribution system, foundation contains DG power distribution network three-phase dissymmetrical impedance model, analyzes and also extracts the short-circuit current fault signature that contains under the DG distribution impedance model.With under the different emulation faults with physical fault under the system failure eigenwert method of carrying out the judgement of fault section as the index of judging fault section.
Background technology
Power distribution network is the important component part of electric system, and is close with customer relationship, ensures that the safety of power distribution network has great importance to electric system operation steady in a long-term.The power distribution network topological structure is complicated, and residing environment has diversity, break down easily, therefore, to the diagnosis of distribution network failure with to repair be the emphasis of China work about electric power person research always.
The essence of conventional electrical distribution system is that single supply is radial.Follow DG access, distribution progressively is transformed into the internet of many power supplys by original single supply Radial network, and profound change has occured the running environment of protection.Power distribution network localization method research center of gravity has been transferred to in the research that contains the DG electrical power distribution network fault location method in recent years.The interval decision method of the existing DG of containing distribution network failure can be divided into impedance analysis method, traveling wave method, injection method on the principle, based on area positioning method and the artificial intelligence localization method of distribution automation system information, the whole bag of tricks all has its certain relative merits.Seeking a kind of fast and accurately fault section decision method has great importance.。
Summary of the invention
The present invention is intended to overcome the deficiency of above-mentioned existing electrical power distribution network fault location method, propose a kind of foundation and contain DG power distribution network dissymmetrical impedance model, system failure feature under research and the extraction dissymmetrical impedance model, corresponding short-circuit current fault eigenvalue when utilizing fault, the location fault section, final formation a kind ofly contains that the DG distribution network failure is interval judges new method, and this localization method is not affected by arc suppression coil, applicable to earth-free, through grounding through arc with through the high resistance ground system; Applicable overhead transmission line, also applicable cable trough ceases to be busy commingled system.
The present invention is that the technical scheme that its purpose of realization is taked is: existing Research foundation use method that theoretical analysis combines with Numerical Simulation Analysis to based on the dissymmetrical impedance model contain containing DG power distribution network short-circuit current fault signature analysis and extracting method and studying based on the fault section localization method that dissymmetrical impedance model and impedance characteristic mate of DG Modeling Methods for Distribution, dissymmetrical impedance model, by Matlab/Simulink numerical simulation data and actual field data the DG distribution network failure interval decision method that contains that proposes is verified at last.Realize as follows:
(1) containing DG distribution network line dissymmetrical impedance model sets up;
(2) containing DG power distribution network dissymmetrical load impedance model sets up;
(3) containing DG power distribution network main feeder power supply and DG dissymmetrical impedance model sets up;
(4) form system impedance matrix and the system's admittance matrix that contains the DG power distribution network;
(5) based on the extraction that contains DG distribution network failure feature of dissymmetrical impedance model.Calculating the fault current of trouble spot when the j node by the false voltage component at power measurement point i place is:
The fault current that is produced by each power supply acting in conjunction is:
This node short-circuit current that calculates from each power measurement point voltage fault component when defining a certain node and breaking down and the absolute deviation of this node short-circuit current of gained is calculated in all power supply actings in conjunction and be the fault eigenvalue that contains the DG power distribution network of studying.Then fault eigenvalue is:
(6) judge based on the DG distribution network failure interval that contains of dissymmetrical impedance model.
By electric network theory as can be known, the fault current that is produced by each power supply acting in conjunction at the place, trouble spot equates with the fault current that is calculated gained by each measurement point voltage failure component.According to this theory as can be known, containing the fault eigenvalue of DG power distribution network at the place, trouble spot is 0, and the node of fault eigenvalue minimum is the fault branch associated nodes.Write down three nodes of E minimum, arrive this, can find fault section.
Inventive principle:
1, uses impedance method and carry out Modeling Research to containing the DG power distribution network
Contain the DG power distribution network and comprise the elements such as system power supply, step-down transformer, circuit, substation transformer, load, fault element and DG, containing the used electricity distribution network model of DG Fault Location for Distribution Network has two kinds of electro-magnetic transient model and steady-state models.Need computing time long in the electro-magnetic transient model emulation process, so this method intend adopting steady-state model.Transformer, circuit, load adopt three-phase symmetrical or asymmetric stable state lumped parameter model in the existing impedance analysis method, system's primary power and each DG use Thevenin theorem equivalent for containing the desired voltage source model of internal resistance according to measurement data, stake resistance adopts linear model, and the system impedance model is linear model.
2, the dissymmetrical impedance model contains DG power distribution network short-circuit current fault signature analysis and extraction
Containing DG power distribution network impedance mathematical model actual is an asymmetric impedance model, description be to comprise the node voltage fault component of each power supply point (comprise feeder line power supply and each DG etc.) and the relational model of short-circuit current in the power distribution network.As contain in the DG power distribution network each power supply place electric current and voltage fault component and can survey, the fault current size in the time of then can obtaining that arbitrary node breaks down in the distribution network by the system impedance matrix model.
This node short-circuit current that calculates from each power measurement point voltage fault component when defining a certain node and breaking down and the absolute deviation of this node short-circuit current of gained is calculated in all power supply actings in conjunction and be the fault eigenvalue that contains the DG power distribution network of studying.
From electric network theory as can be known, suppose that a certain node breaks down, the fault current of this node that then calculates by each power supply point voltage failure component is identical with the fault current that all power supply actings in conjunction produce.According to this theory, then improving the fault eigenvalue that contains the DG power distribution network under the impedance model at place, real trouble spot is 0.Take node serial number as variable, calculate the fault eigenvalue of each node, the node of fault eigenvalue minimum is as output, and this node is trouble spot or fault branch node.If this node failure eigenwert is 0, then fault occurs in this node; If this node failure eigenwert is greater than 0, two branch roads that then link to each other with this node are possible fault branch.
The present invention considers the asymmetry of distribution system especially, sets up to contain DG power distribution network three-phase dissymmetrical impedance model, analyzes and extract the short-circuit current fault signature that contains under the DG distribution impedance model.With under the different emulation faults with physical fault under the system failure eigenwert method of carrying out the judgement of fault section as the index of judging fault section.
Description of drawings
Fig. 1 is fault section decision method process flow diagram of the present invention;
Fig. 2 is for containing DG distribution network system figure.
Embodiment
Set up more accurate dissymmetrical impedance model to containing the DG power distribution network, comprise the dissymmetrical impedance model of dissymmetrical impedance model, main feeder power supply and each DG of dissymmetrical impedance model, the load of dissymmetrical impedance model, the circuit of transformer.Formation contains admittance matrix and the impedance matrix of DG distribution system.The definition of failure definition eigenwert.DG power distribution network short-circuit current fault signature is analyzed and is extracted based on the dissymmetrical impedance model.Short-circuit current fault eigenvalue according to gained is judged the fault section that contains the DG power distribution network.

Claims (5)

1. the interval decision method of DG distribution network failure that contains based on dissymmetrical impedance model short circuit current fault signature uses method that theory analysis combines with Numerical Simulation Analysis to reach the fault section localization method that mates based on dissymmetrical impedance model and impedance characteristic and study contain DG power distribution network short circuit current fault signature analysis and the extracting method that contain DG Modeling Methods for Distribution, dissymmetrical impedance model based on the dissymmetrical impedance model on existing Research foundation, finally by Matlab/Simulink numerical simulation data and actual field data, the DG distribution network failure interval decision method that contains that proposes is verified.
2. realize as follows:
(1) containing DG distribution network line dissymmetrical impedance model sets up;
(2) containing DG power distribution network dissymmetrical load impedance model sets up;
(3) containing DG power distribution network main feeder power supply and DG dissymmetrical impedance model sets up;
(4) form system impedance matrix and the system's admittance matrix that contains the DG power distribution network;
(5) based on the extraction that contains DG distribution network failure feature of dissymmetrical impedance model;
(6) judge based on the DG distribution network failure interval that contains of dissymmetrical impedance model.
3. calculating the fault current of trouble spot when the j node by the false voltage component at power measurement point i place is:
The fault current that is produced by each power supply acting in conjunction is:
This node short-circuit current that calculates from each power measurement point voltage fault component when defining a certain node and breaking down and the absolute deviation of this node short-circuit current of gained is calculated in all power supply actings in conjunction and be the fault eigenvalue that contains the DG power distribution network of studying.
4. then fault eigenvalue is:
By electric network theory as can be known, the fault current that is produced by each power supply acting in conjunction at the place, trouble spot equates with the fault current that is calculated gained by each measurement point voltage failure component.
5. according to this theory as can be known, containing the fault eigenvalue of DG power distribution network at the place, trouble spot is 0, and the node of fault eigenvalue minimum is the fault branch associated nodes, writes down three nodes of E minimum, arrives this, can find fault section.
CN201210532103.3A 2012-12-12 2012-12-12 Based on dissymmetrical impedance model short-circuit current fault signature containing the interval decision method of DG distribution network failure Expired - Fee Related CN103018633B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103390887A (en) * 2013-08-07 2013-11-13 孙鸣 Method for isolating faults of power distribution system with micro-grid
CN103792453A (en) * 2014-02-27 2014-05-14 国家电网公司 Method for judging single-phase short circuit protective actions of power grid current limiting circuit breaker
CN103983896A (en) * 2014-04-24 2014-08-13 云南电力试验研究院(集团)有限公司电力研究院 Distribution network line single end distance measurement result calibration method based on distribution network power quality sampled data
CN104316840A (en) * 2014-11-07 2015-01-28 国家电网公司 Positioning method and device for fault branches of mixed multi-branch nodes of power distribution network
CN105842516A (en) * 2016-03-21 2016-08-10 陕西省地方电力(集团)有限公司 Calculation method for short circuit current of power system containing large number of draught fans
CN107064736A (en) * 2017-03-22 2017-08-18 华南理工大学 A kind of Fault Locating Method that inverse distributed power power distribution network is connect containing many T
CN105759173B (en) * 2016-03-31 2018-05-08 中国科学院电工研究所 The adaptive failure Section Location of power distribution network containing distributed generation resource

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101404411A (en) * 2008-10-30 2009-04-08 中国电力科学研究院 Fault fitting method in load modeling
CN101789598A (en) * 2010-03-05 2010-07-28 湖北省电力试验研究院 Power system load modelling method
CN101917055A (en) * 2010-08-05 2010-12-15 华北电力大学 Branch circuit similarity-based wide area backup protection method
CN101968525A (en) * 2010-10-09 2011-02-09 杭州市电力局 Fault positioning method for power distribution network by combining simulation calculation and real-time monitoring
CN102377180A (en) * 2011-08-17 2012-03-14 广东电网公司电力科学研究院 Power system load modeling method based on electric energy quality monitoring system
CN102565623A (en) * 2011-12-21 2012-07-11 北京交通大学 Method and device for online fault search positioning of multi-branch complex distribution network
CN102567603A (en) * 2010-12-16 2012-07-11 安徽省电力公司 Method for automatically generating BPA calculation file based on actual measurement topology and measured data

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101404411A (en) * 2008-10-30 2009-04-08 中国电力科学研究院 Fault fitting method in load modeling
CN101789598A (en) * 2010-03-05 2010-07-28 湖北省电力试验研究院 Power system load modelling method
CN101917055A (en) * 2010-08-05 2010-12-15 华北电力大学 Branch circuit similarity-based wide area backup protection method
CN101968525A (en) * 2010-10-09 2011-02-09 杭州市电力局 Fault positioning method for power distribution network by combining simulation calculation and real-time monitoring
CN102567603A (en) * 2010-12-16 2012-07-11 安徽省电力公司 Method for automatically generating BPA calculation file based on actual measurement topology and measured data
CN102377180A (en) * 2011-08-17 2012-03-14 广东电网公司电力科学研究院 Power system load modeling method based on electric energy quality monitoring system
CN102565623A (en) * 2011-12-21 2012-07-11 北京交通大学 Method and device for online fault search positioning of multi-branch complex distribution network

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103390887A (en) * 2013-08-07 2013-11-13 孙鸣 Method for isolating faults of power distribution system with micro-grid
CN103390887B (en) * 2013-08-07 2015-11-25 孙鸣 Containing the distribution system failure separation method of micro-capacitance sensor
CN103792453A (en) * 2014-02-27 2014-05-14 国家电网公司 Method for judging single-phase short circuit protective actions of power grid current limiting circuit breaker
CN103983896A (en) * 2014-04-24 2014-08-13 云南电力试验研究院(集团)有限公司电力研究院 Distribution network line single end distance measurement result calibration method based on distribution network power quality sampled data
CN104316840A (en) * 2014-11-07 2015-01-28 国家电网公司 Positioning method and device for fault branches of mixed multi-branch nodes of power distribution network
CN105842516A (en) * 2016-03-21 2016-08-10 陕西省地方电力(集团)有限公司 Calculation method for short circuit current of power system containing large number of draught fans
CN105842516B (en) * 2016-03-21 2018-07-06 陕西省地方电力(集团)有限公司 A kind of computational methods of the Power System Shortcuts electric current containing a large amount of wind turbines
CN105759173B (en) * 2016-03-31 2018-05-08 中国科学院电工研究所 The adaptive failure Section Location of power distribution network containing distributed generation resource
CN107064736A (en) * 2017-03-22 2017-08-18 华南理工大学 A kind of Fault Locating Method that inverse distributed power power distribution network is connect containing many T
CN107064736B (en) * 2017-03-22 2019-04-09 华南理工大学 A kind of Fault Locating Method connecing inverse distributed power power distribution network containing more T

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